Syringe



S p 1950 F. E. BRONK ETAL 2,523,809

SYRINGE Filed May 26, '1949 IN VEN TOR. FAY E BRONX GORDON KI CAMERON THE/l? ATTORNEY Patented Sept. 26, 1950 UNITED sums PATENT omen Ifay E. Bronk and Gordon K. Cameron, Roches ter, N-. Y.,as'signor's to Bitter oem 'anyfma, Rochester, N. Y.', a corporation of Delaware Qpplieationlllay 2 6, 1949, SerialNo. 95,446

8 Claims.

thi ihyehheh relates 2 s r hsee, 9 th t e ada ted forhee 1. eehta ahe'ethelt heqif el lf fi i c fi i9 1 l 'i l ll sheathe -w E ld i '2 hei t Qt 'eh heh heh eet i the hv hheh being th /a sle h: P?I? CQ l eyhhse ef the e eve qh rh t hav e more him llhp ihfi qh eh l eme e t eehehhe eni Another object is the provision or a syringe 9 t h r ter sti d h e f h ld. h h etr meh and h h qhs hai qhhe 1 5 wit e eehree e i h i hee ed' hh hie, maintained at a predetermined temperature by n emehee v'r ulefi e x hlehe 'ef; he 1 5 1 he ei eeu e hrehe-h the. eehsh tq t and e rhhs 9. e waste when l A th r ieet s e sup l eheh. hv s r n e, having valve means or a'niiinproved and nior'e practical character tor manually controllingthe up of; fluid he i t e t /heht h fhle Ahhrther t i h? r q liq e. e h e the ebeve wr he h sim e. d; ehi i ht thermostaticmeans for automatically regulating the circulation or heated fluid through the i'ns'tru'g ment to maintain its temperature ready for instant use.

fitill a further object is to provide an instrument havingthe above advantages in a form of constructionwhich is relatively inexpensive to manufacture and reliable in operation."

To these and other ends the invention resides in 'certain improvements and combinations of parts, all as will be hereinafter more fully d scribed, the novel features being pointed out in the claims atthe end of the specification.

In the drawings:

Fig. '1 is an enlarged elevation of a portion of a syringe embodying the present invention, with parts in central, longitudinal section;

Fig. 1 is a central, longitudinal section of the remaining portion of the syringe shown in'liig. 1, and f Fig. 2 is an enlarged, sectional view on the line 2.2 in Fig. 1.

The invention is embodied in the present instance, by Way of illustration, in a syringe having a tubular handle comprising an outer sleeve l extending throughout the major length thereof and having fixed in its upper end, as by means of screws 1 I, a head [2 to which is attached the usual or any suitable nozzle I3. formed with a fluid passagewayleading to the nozzle from a socket I5 in the head having an enlargement. l6 at its lower. end opening through the lower end of the head. A tube I! has its upper end inserted in the socket and forms part The head is ,1; a f uid, as a ew y h q he. hand e ea ing to the nozzle. The end of the tube is sealed h he eeeh t b m ehe o e r he e k n fil r ubber or ther im la m t r e boeiti hed in. the eqeh e la geme t "in eta n d the ein by mean o a pla e ,9 se i cex v t the ewi fehsi hi h hee by eee w 20.-

The handle-sleeve [Q is divided into upper and ower hexhhe e, f ehd'ZL, by Pa i i n hi ehs emh ieihe e. ee. of u per end lowe eads, and "24, supporting between them a flexible par heh ish ht. ei r bber er i h t t el-Y These h al er u por ed y h ehs e e he de e hed an the wer heed H i foimee w th e, sl t Z5 e va ve he h eeht el h hhhhh hih n' be Weeh the lQ r hambe 22 nd a PFRSS eh e ih th h he u er new +1 ef h tube I? which; has 'it's awaite seated ina socket in the h jeh. h e ehh- 'lheitel'v heen ieem se h. he l??? sliding, i 'ef e' e upper h e f l se eeh feheve the e eh ei th he l er'eeeheeeheh th a d we e t ehhe these hi h wi new de hh a means r'eeth tih sheh va ve jehlh for controlling the supply of fluid to' the man; is rh h h edeh re ee the h e chamber 2 cornprising Manner sleeve 3U having a close sliding fit'w'ithin' t eater of needl sleeve ml "fi fi vetflhasflxed tneieinhearits w r e e h r t hil q mee 'e e ir w h e tapped her w i h thre d t d 3 i ad; ih 'h h l The hhher e d e th le er 'elw I lic 3i i9 2 ehses eht y a teel e. ediuetehly e 'h w it threh h he he dv hd he; leWer'ehd hd hte e e, he ew the head e. p i le' h' hhh iht it er eeei e th nd of the e t jh 2 hi e eh he'v lve e u l in fluid to th'e nozzjle. A coiled con pression'spring' h hl twee t e heels. ehel 3.! hi e m h f eihe'lthe, h'ees 3! eh l th stud to re: a e th vel ee val e e h iih h eh e eh 9 9 9 5 6 lev r '5. pi ehell m unt d a its l wer n band 31 elhl 'led el hhdn the hand e ee e "2 hi eihiz h t h 'h (he l hewhlh'e 36 he e zhr f? htehd e le e the" e 'e F n he hehd sleeve H1 a thhl e l 'v' j n e ih 'ifllih sleeve 9.- Leve 1 i h t h'l 'r iterated ihe he lhhh hel by th hiih the hee e h h 'helqihe'hh syringe, 6 p ee e ehd' o l ve Prime feiv i e. the le er $9.11 3e dQWh: w 91 i e heht l h sea sl de sleev itz a tee he. sh t? i? '29 eh ere h e hi ee'eh, t e valv .rheeh ne as the pressure of the thumb is maintained on the lever 36.

The supply valve means preferably comprises a sleeve 4|, fixed to the valve stem 29 below the flexible partition 25, and the stem has an enlargement 42 engaging the upper side of the partition, so that the stem and partition move together b flexing the partition in recesses provided in the adjacent ends of the heads 23 and 24. The lower head has a constricted portion 43 formed with an opening of larger diameter than the stem sleeve 4|, so that the sleeve moves up and down with suflicient clearance in the opening to permit free passage of the fluid therethrough. The valve body is formed by a ring 44, of rubber or like material, closely surrounding the lower end of the valve stem in position to engage the valve seat 26 and to be engaged and moved away from the seat by the lower end of the valve stem sleeve 4|. A washer 45, secured by a nut 45 on the lower end of the stem, serves to hold the valve ring on the stem. A coiled compression spring 4! bears at its upper end against the washer and at its lower end against a head 48, hereafter described, so as to yieldably press the valve ring 44 against its seat 26. The opening through the valve seat leads through the opening in the constriction of the lower head 24 into the recess at its upper end which communicates by means of a passage 49 in the head with the lower end of the tube I 1.

The head 23 has an enlarged upper end fitting the interior of the handle sleeve l and supported on the upper end of an intermediate sleeve i) which is adjustable in the sleeve I (I by means hereafter described. The head 24 is adjustably slidable in the sleeve 50 and has adjacent its lower end a shoulder by which it is supported on the upper end of an inner sleeve 5| which is adjustably slidable in sleeve 50, as hereafter described, the heads 23 and 24 being adjustably supported to suitably position the sleeve seat 26 and to maintain the heads in close contact with the opposite sides of the flexible disk 25.

The lower chamber 22 of the handle is located in the innermost sleeve 5|, the upper end of which has a sealed connection with the head 24 by a ring packing 52 supported in a reces in the lower end of the head, as shown. The upper end ofv sleeve 5! is internally threaded, as at 53, to receive the above mentioned head 48 which is thus adjustably screwed into the head through its upper end. The purpose of the head 48, with bellows attached. is to provide temperature adjustment.- By this adjustment, pressure and travel of thebellows 65 and return spring H can be varied. For instance, by reducing the pressure on the bellows more travel is necessary to close the valve 69 resulting in higher temperature in the syringe handle as linear travel of the bellows is directly proportional to the temperature applied to it. The lower end of the innermost sleeve 5! rests on a bottom head 54 (Fig. 1*) adjustably threaded in the lower end of the intermediate sleeve 50, while the lower end of this intermediate sleeve rests on the top of a guard sleeve 55 adjustably threaded in the lower end of the outer or handle sleeve 10. Adjustment of sleeve 55 serves to adjust the intermediate sleeve longitudinally of the handle, while adjustment of the head 54 serves to adjust the innermost sleeve 5 I, for the purposes described above.

- The lower head 54 is formed at its lower end with concentric upper and lower nipples, 56 and 51. The lower nipple communicates through a passage 58 with the adjacent end of the lower chamber 22, while the upper nipple 56 communicates through a passage 59 with a valve opening 60 at the center of the head and leading into the lower chamber. These nipples are connected by flexible inner and outer tubes, 6! and -62, respectively, with the equipment stand on which the syringe is extensibly supported, as well understood in the art, tube 6! being adapted for connection with a source of supply of heated water or other fluid, of known or suitable construction, carried by the stand, while the outer tube 62 forms a waste outlet from the syringe leading to a suitable discharge conductor in the stand. A stiffening sleeve 63 is secured around the tubes under the cover 64 thereof, so as to extend above and below the lower end of the guard sleeve 55 and prevent excessively sharp bending and injury of the tubes at the lower end of the guard.

It is evident from the above construction that heated fluid from a source in the equipment stand is supplied through the inner tube 6i and the passageway 58 of the lower head 54 to the lower chamber of the handle and through the latter to the supply valve means in the head 24. On operation of the manual lever 35, the supply valve is opened and the heated fluid is supplied through the passageways 49 and 2'! and the tube I! to the syringe head and nozzle. When the syringe has been standing for any substantial period, such fluid tends to become cooled in the tube 6| and in the lower chamber and passageway through the instrument, and the invention comprises thermostatic means for maintaining a continuous circulation of heated fluid at a low rate through the tube 6! and the lower chamber of the instrument to maintain the temperature of the fluid in these parts and of the instrument. as a'whole. so that a supply of suitably heated fluid is quickl available on operation of the lever 36.

Such means for maintaining the temperature of the fluid and of the instrument comprises a thermostatic element, preferably a temperatureresponsive, expansible bellows 65, of any known or suitable construction, located in the chamber 22, in spaced relation with the inner wall of the innermost sleeve 5!, as shown, with its upper end bearing against and preferably fixed to the lower face of the head 48. The bellows is filled with a liquid, such as acetone, which expands with increase in temperature, as well understood in the art, the bellows being filled through an inlet tube 66 at its lower end and the tube being thereafter sealed to prevent the escape of the liquid. The lower end of the bellows is provided with means for actuating the valve cooperating with the valve seat 60 leading to the waste outlet.

Such outlet valve is preferably in the form of a rod 61 fixed in a socket in the lower head 68 of the bellows and the projecting lower end of the rod is formed with a portion 59 tapered inwardly toward the free end of the rod, for cooperation with the valve seat, beyond which the rod has an end m of uniform reduced diameter. A coiled compression spring H, seated in the recess in the lower head 54, bears at its upper end against the lower head 68 of the bellows to press it upwardly and withdraw the tapered portion of the valve rod from the seat, to increase the escape of fluid from the chamber to the waste outlet.

It is further evident from this construction that when the syringe is brought into condition for use by the supply of heated fluid through the tube 6| such fluid circulates in the lower chamber 2.2. around, the thermostatic bellows, causing its expansion and the, progressive throttling of the escape of fluid through the valve to the waste outlet. While, the instrument and the fluid in it are relatively cold, the bellows is collapsed, withdrawing the valve. rod from its seat and permitting a substantial flow of the heated, fluid through the lower chamber. around the bellows. As the temperature of the. instrument and its contained fluid is thus raised, thebellows. expands to partially close the outlet valve and reduce the circulation. When the parts: are fullyheated, the outlet valve is closed to an extent which permits only the smallcirculation which isnecessary to maintain the parts at the desired temperature.

The invention thus provides. a syrin e, in which the nozzle head occupies a fixed position in the instrument handle and the actuating means. for the. supply valve are located wholly outside the fluid passageway, such actuating parts being readily accessible for any necessary adjustments by removal of the nozzle head from the handle. The temperature of the instrument and the fluid therein and in its supply line are automatically maintained by a regulated circulation of the heated fluid controlled by a simple and effective arrangement of waste outlet valve and thermostatic actuating means therefor, located in one portion of the instrument handle, thus obviating the more complicated electrical heating units and circuit connections heretofore commonly employed for this purpose. These advantages are afforded by a relatively simple and practical type of construction which is relatively inexpensive to manufacture and reliable in operation.

It will thus be seen that the invention accomplishes its objects and while it has been herein disclosed by reference to the details of a preferred embodiment, it is to be understood that such disclosure is intended in an illustrative, rather than a limiting sense, as it is contemplated that various modifications in the construction and arrangement of the parts will readily occur to those skilled in the art, within the spirit of the invention and the scope of the appended claims.

We claim: 7

1. A syringe comprising a handle provided with a nozzle and with a fluid supply passageway leading therethrough to said nozzle, fluid conducting means connected with said handle passageway and adapted for connection with a source of heated fluid, a waste outlet from said passageway, a valve controlling said outlet, and thermostatic means associated with said handle for actuating said outlet valve to automtically regulate the circulation and temperature of fluid in said passageway.

2. A syringe comprising-a handle provided with a nozzle and with a fluid supply passageway leading therethrough to said nozzle, fluid conducting means connected with said handle passageway and adapted for connection with a source of heated fluid, a valve controlling the supply of fluid through said passageway, manually operable means for actuating said supply valve, a waste outlet from. said passageway, a valve controlling said outlet, and thermostatic means in said passageway for actuating said outlet valve to automatically regulate the circulation and temperature of fluid in said passageway.

3. A syringe comprising a hollow handle divided interiorly into upper and lower chambers, a nozzle on the upper end of said handle, fluid conducting means connected with said lower chamber and adapted for connection with a source. o eated l id, flui p s agew ommunicating with said lower chamber and leading through said upper chamber to said nozzle, a valve. controlling the supply of mud through said passageway, means in said upper chamber for actuating said valve having a manually operable part on the exterior or said handle, a Waste oute from. said lowe cham .,a. .ve co oll g said. outl t, and herm stat c means. n sa d. lo chamber f r actuatin said. ou e valve t aut matieally regulate the circulation and temperaure of fluid upplied th o gh s i pass way- .1- A. syring mprising. a tubul a d ivided in er or y int upp r n ow r cham e s, a. nozzle fixed: o th upper en oi a l fluid conducting means connected with said lower chamber and adapted for connection with a s ur e. f heated f uid. a pas g way c mu cat ng ith. s i lowe c amber and leading through said upper chamber to said nozzle, a valve for said passageway having a stem located exteriorly thereof, means movably mounted in said upper chamber having an adjustable abutment for actuating said valve stem and a manual actuating part therefor located exteriorly of said handle, a waste outlet from said lower chamber, a valve controlling said outlet, and thermostatic means in said lower chamber for actuating said outlet valve to automatically regulate the circulation and temperature of fluid in said passageway.

5. A syringe comprising a tubular handle divided interiorly into upper and lower chambers, a nozzle fixed on the upper end of said handle, fluid conducting means connected with said lower chamber and adapted for connection with a source of heated fluid, a, passageway communicating with said lower chamber and leading through said upper chamber to said nozzle, a valve for controlling the supply of fluid through said passageway and having a stem located in said chamber exteriorly of said passageway, a sleeve slidably mounted in said upper chamber and having an adjustable abutment for actuating said valve stem, a manually operable member on the exterior of said handle for sliding said sleeve and controlling the supply of fluid to said nozzle, a waste outlet from said lower chamber, a valve controlling said outlet, and thermostatic means insaid lower chamber for actuating said outlet valve to automatically regulate the circulation and temperature of fluid in the passageway.

6. A syringe comprising a tubular handle divided interiorly into upper and lower chambers, a nozzle fixed on the upper end of said handle, fluid conducting means connected with said lower chamber and adapted for connection with a source of heated fluid, a passageway communicating with said lower chamber and leading through said upper chamber to said nozzle, a valve for controlling the supply of fluid through said passageway and having a stem located in said upper chamber exteriorly of said passageway, a sleeve slidably mounted in said upper chamber and having therein a partition containing a threaded stud for actuating said valve stem, a manually operable member on the exterior of said handle for moving said sleeve and stud to actuate said valve and control the supply of fluid to said nozzle, a waste outlet from said lower chamber, a valve controlling said outlet, and thermostatic means in said lower chamber for actuating said outlet valve to automatically regulate the circulation and temperature of fluid in the passageway.

7. A syringe comprising a handle provided with a nozzle and with a fluid supply passageway leading thereto, fluid conducting means connected with said handle passageway and adapted for connection with a source of heated fluid, a valve controlling the supply of fluid through said passageway, manually operable means for actuating said supply valve, a waste outlet from said passageway, valve means adapted to progressively throttle the escape of fluid through said outlet, and a thermostatic element in said passageway and having an actuating connection with said valve means for regulating the circulation and temperature of fluid in said passageway.

8. A syringe comprising a handle provided with a nozzle and with a fluid supply passageway leading therethrough to said nozzle, fluid conducting means connecting said handle passageway and adapted for connection with a source of heated fluid, a Waste outlet from said passageway, a valve controlling said outlet and a temperatureresponsive, expansible bellows in said passageway provided with means for actuating said outlet valve to automatically regulate the circulation and temperature of fluid in said passageway.

FAY E. BRONK.

GORDON K. CAMERON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,124,747 Pieper July 26, 1938 2,110,339 Pieper Mar. 8, 1938 

